Polishing a feed ramp is usually a fix for shoddy construction techniques, or poor design, or poor quality control.
Never have it done unless a gun is exhibiting feed issues. Polishing or throating a gun that is working just fine can actually turn a working reliable firearm into a jamomatic.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent